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《Journal of Safety and Environment》 2009-02
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Heightening the removal efficiency of Microcys-tis aeruginosa through PAC flocculation with FeCI_3 and kaolin as sub-flocculant

SHI Zhou~(1,2),ZHANG Li-juan~(1,2),LUO Yue-ping~(1,2,3),WANG Sheng-cai~3(1 Key Laboratory of Building Safety and Energy Efficiency,Ministryof Education,Hunan University,Changsha 410082,China;2 Collegeof Civil Engineering,Hunan University,Changsha 410082,China;3 Environmental Monitoring Center of Hunan Province,Changsha 410004,China)  
This paper takes its aim at finding the optimal way of re- moving Microcystis aeruginosa,a kind of frequently accounted alga in eutrophic waters,through PAC flocculation with FeCl_3 and kaolin as sub-flocculant.As a kind of alga in eutrophic waters,Microcystis aeruginosa tends to release toxic extracellular polymers during its telophase growth.Therefore,we hav e chosen it as the model algae to evaluate algae removal efficiency through enhanced flocculation.As a matter of fact,our experiments have been done,which enabled us to find polyaluminum chloride (PAC)used as a superior flocculant to FeCl_3 and PFS in alga removal at the same dosage.However,the re- moval efficiency of M.aeruginosa through PAC can be remarkably improved with the help of kaolin as pre-coagulant aid.When 20 mg/L kaolin and 15 mg/L PAC were added in the sequence when mixed uniformly into the sample,it was found that the removal effi- ciency of Chla turned to be speeded up to 82.34%,whereas the residue turbidity was found to drop to 2.0 NTU.In addition,if PAC was used as a main flocculant with kaolin and FeCl_3 as pre-and post- flocculant aids,it was possible to neutralize the charge with FeCl_3 added.Moreover,increase of the volume of FeCl_3 also resulted in speeding up the floc-sedimentation.It is thus suggested that FeCl_3 could be added in 3 min after flocculation with 1 mg/L as an optimum dosage.And,finally,the effects of pH value could be evaluated in the range of 5-9 on M.aeruginosa removal through PAC floccula- tion.Therefore,the results of our experiments have shown that the effects could be expected to get minimized while satisfied results could be obtained with FeCl_3 used as post-flocculant aid.Furthermore, since kaolin is one kind of clay,which can be found almost every- where,the method we propose here is highly promising for its low cost and high efficiency.
【Fund】: 国家自然科学基金项目(50778065);; 欧盟国际合作项目(PL510897);; 湖南省重点科技项目(03WHY1001)
【CateGory Index】: TU991.2
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